Classification
414 - Phonology & phonetics
576 - Genetics & evolution
900 - History & geography
600 - Technology
12
620 - Engineering & allied operations
12
700 - The arts; fine & decorative arts
10
580 - Plants (Botany)
6
333 - Economics of land & energy
5
363 - Other social problems & services
4
340 - Law
3
400 - Language
2
581 - Specific topics in natural history
2
000 - Computer science, information & general works
1
304 - Factors affecting social behavior
1
330 - Economics
1
380 - Commerce, communications & transportation
1
410 - Linguistics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
551 - Geology, hydrology & meteorology
1
610 - Medicine & health
1
800 - Literature & rhetoric
1